My 21 month old has been a great night sleeper since she turned one. Her bedtime is 6:30 pm and she usually wakes up 7-8 am. I know that's a lot of nighttime sleep but she's always been a terrible napper. She takes one 45 min-1 hr long nap per day.

The last few mornings she's been waking up between 4:30-5:30 am screaming bloody murder (and won't go back to sleep). She usually wakes up happily and lays in her crib until we go get her. She's also refusing to nap unless we hold her. This is likely unrelated but she's been wanting me to hold her constantly the last few days.

What's going on? Anyone experience/suggestions? Is there a sleep regression around this age?

ETA - we've never done any type of sleep training with her and would prefer to avoid it.